| Standard label: | Long-term Commercial Paper |
| Name: | us-gaap:LongtermCommercialPaperCurrentAndNoncurrent |
| Documentation: | Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer). |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LongtermCommercialPaperCurrentAndNoncurrent |
| Label | Role | Language |
| Long-term Commercial Paper | http://www.xbrl.org/2003/role/label | en-US |
| Long-term Commercial Paper, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.19,20,22) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.16) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |
| FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03.16) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |